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Most of the failures to stop a DIAL session is because the session no
longer exists. So we query for the app's current status, and if it's not
running, we remove the corresponding route.

Bug: 1141714, b/158693455
Change-Id: I71e9770d1188861c37bce996fedf30461a0f9bd6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2492918
Commit-Queue: Takumi Fujimoto <takumif@chromium.org>
Reviewed-by: mark a. foltz <mfoltz@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Cr-Commit-Position: refs/heads/master@{#827458}